1. Understanding the rules: federal legal considerations for state-based approaches to expand coverage in California Publication: [Oakland, Calif.] : California Health Care Foundation, February 2018 Subject(s): Insurance CoverageInsurance, Health -- organization & administrationCost SharingEligibility DeterminationFederal GovernmentFinancing, GovernmentHealth Benefit Plans, EmployeeHealth Insurance ExchangesInsurance BenefitsMedicaidMedicarePublic SectorSingle-Payer SystemState GovernmentUndocumented ImmigrantsUniversal Health InsuranceHumansCaliforniaUnited StatesUnited States.United States.